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Two object A and B are kept one after an...

Two object A and B are kept one after another in front of a concave mirror of focal length 7.5 cm . Both the mirrors form images of the same size. Now, if A is thrice the length of B and kept at a distance of 30 cm from the mirror, then what is the distance at which B is kept?

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The correct Answer is:
15 cm
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